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<title>IDBDatabase.createIndex() - If an index with the name name already exists in this object store, the implementation must throw a DOMException of type ConstraintError </title>
<link rel="author" title="Intel" href="http://www.intel.com">
<link rel="help" href="https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#widl-IDBObjectStore-createIndex-IDBIndex-DOMString-name-DOMString-sequence-DOMString--keyPath-IDBIndexParameters-optionalParameters">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support.js"></script>
<div id="log"></div>
<script>
var t = async_test(),
    open_rq = createdb(t);

open_rq.onupgradeneeded = function (e) {
    var db = e.target.result;
    var ostore = db.createObjectStore("store");
    ostore.createIndex("a", "a");
    assert_throws("ConstraintError", function(){
        ostore.createIndex("a", "a");
    });
    t.done();
}
</script>

